While there have been many screens (including the one above) and videos of a rumored possibility of having both Yoda and Darth Vader from Soulcalibur IV in one platform, Namco Bandai has "no plans" in making it happen as of yet.
"We don't have any plans," said by game director Katsutoshi Sasaki about implementing a DLC that will enable players to play either Yoda or Darth Vader on one console. Currently, the only way to play Yoda in Soulcalibur IV is through the Xbox 360 version and Darth Vader on the Playstation 3.
For now, we'll leave the possibility of clashing lightsabers in Soulcalibur IV up to our imaginations. Check out a review of Soulcalibur IV after the cut.
Kotaku: There Are "No Plans" For Yoda v Vader In Soul Calibur IV